Exposure-indicator for photographic cameras



G. W. WEISS.

fxPosuRs INDICATOR roR PRomGRARRlc CAMERAS.

APPLICATION FILED NOV. 15. |916-- Patented Nov. 18, 1919.'

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GEORGE W. WEISS, F BROOKLYN, NEW YORK.

EXPOSURE-INDICATOR Eon PHoToGaArHIc CAMERAS.

Specification of Letters Patent. Patented NOV. 18,- 1919.

Application nled November 15, 1916. Serial No. 181,448.

a visible sign whenever an exposed' section or element of the sensitized surface or medium is in position behind' the lens, and thereby to give a positive indication that ,the apparatus is not in ro r` condition for another exposure. Tld tiiills end, the invention involves in combination with a magazine camera having a movable shutter, of any referred type, of a movable semaphore, ad-

justa'ble with respect to a sight opening in the camera box, which yis .actuated by the movement of the shutter to display an exposure indication on said semaphore through said opening, together with means operated by the advance of the sensitized medium to restore the semaphore to its normal osition and thereby apprise the operator t at the reviously exposed sensitized surface has een withdrawn from behind the lens, and that a fresh surface has been adjusted to proper position for an exposure. T e invention is illustrated in `one of its simplest forms of application in the accompanying drawings, in which- Figure 1 is a sectional front elevation of a camera of the roll-film, oscillating-shutter type, having the invention applied thereto, the section being taken on the line 1-1 of Fi 2.

ilig. 2 is a sectional side elevation on line 2-2 of Fig. 1. I Referring to thedrawings, as exemplifyina typical application of the invention, 1 1n 1 cates the box or housing ofan ordinary hand camera provided with a transverse partition 1 which constitutes a lens board and a support for certain of the adjuncts of the camera, suh asithe shutter, its operating mechanism, and the indicating device or semaphore which is involved in the present invention. Mounted in the partition 1 is a lens 2, shown in dotted lines in Fig. `1, and mounted on suitable rolls 4 and 5 in i 56 the chamber or compartment behind the lens board is a strip or roll-film 3, such as is commonly employed in cameras of this character, one of the rolls 5 being provided with an operating hand-piece 6 by means of which the film may be fed across the rear of the 60 interior frame or housing in the usual manner. e

Pivotally mounted on the lens board 1 by means of a central stud or screw 11 is an oscillatin shutter 10 having a sight open- 65 ing 12 w ich is adapted to'move across the lens opening 2, and said vshutter is provided with a series of projecting studs or pins 10,

, 10b, 10, 10d, and 10e, which coperate with a latch or trigger 2O pivoted at 21 to the lens 70 board and provided with the usual cam liange 22 which coperates with the pins 10b to 10 respectively, depending on whether an instantaneous or a time exposure is desired, as will be understood. Slidably mounted on the lens board 1 by means of the pin and slot connection 24, 25 is a lever 23 which, when raised, is interposed in the path of the pin 10 and serves to arrest the movement of the shutter 10 so that the opening 12 regis- 80 ters with the lens 2 for time exposures, as will be understood. The lower portion of the shutter 10 is provided with a recessed edge 13 which cooperates with a fixed stop 14 to limit the movement of the shutter in 85 both directions. A

The front wa-ll of the camera is provided with a sight opening 9, indicated in dotted lines in Fig. 1, which is adapted to co-- operate with an oscillating arm, constituting a semaphore'O, which is preferably provided wlth two angularly disposed arms 51 and 52, preferably marked with the word Exposed, so that when either of said arms 51 and 52 is brought into registry with the 95 sight openings 9, it will give a proper indication that the section of sensitized medium lying vbehind the lens has been exosed and therefore must be withdrawn beore another exposure is made. The semaphore 50 is pivoted to the lens board, as at 53, and extending laterally from the semaphore 50 in either direction are two arms 54 and 55. Projecting from the lens board in the angle between the armv 54 and sema- 105 phore 50 is a stop pin 56- Which 'llmits the movement of the semaphore in both of its' extreme positions.

Mounted in vertical journalA bearings 31, 31 on the supporting plate 30, attached to- 11G theinner frame of the camera, is a vertical shaft 32 provided at its top with a wheel 33 having radial teeth or pins 34, adapted to cooperate withspaced erforations 3 along the top edge of the m-roll 3, so that as Y said film-roll is progressed or moved from one roller to the other, the wheel 33 and shaft 32 are revolved. Mounted on the shaft 32 are two beveled ars 35 and 36 which coperate respective y with beveled pinions 37 and 38 connected to the endsof orizontal shafts 39 and 40,. journaled in bearings inthe plate 30. On the forward ends lof the shafts 39 and 40 are mounted disks 41 and 42 respectively, which carry` on their outer faces near the peripheries thereof pins 43 and 44 respctively, which arm 54 of semaphore 50, and which thereare adapted to coperate wit arm 55 of the semaphore 50. Mounted on the front face of the shutter the horizontal V10 is an additional pin 10? which is adapted toengage the extreme end of the horizontal fore serves to move the semaphore to bring one of the upper arms thereof into registry with the sight opening 9 and to display the eX osed indication.

he normal operation of the ap aratus is as'rollows: Assuming that the re ative disposltion of the several elements illustrated in Fig. 1 is proper for an exposure of a section. of the ilm 3, the shutter 10 is in closed position with the opening 12 displaced to the left :of the lens 2 and the semaphore 50 stands in vertical position with its two arms 51r and 52 disposed on either side of the sight opening 9 and the transverse arms 54 and' 55 of the semaphore are in horizontal position. desired, the lever 2O is rocked to the right, thereby causing the end 22 thereof to pass out of engagement with the pin 10" and permitting th'espring 15 to move. the shutter 10 in a clockwise direction tothe full eX# tent of its throw and until the stop 14 engages the right4 hand shoulder ofthe cutaway portion 13 of the shutter. As the shutter rotates, the pin 1 0 strikes the outer end of-arm-54 and rocks the semaphore 50 to the leftdintilthe latter is arrestedby the stop 56,' with the upper arm' 52 of the semaA phore lying directly behind the sit openl that the section of the sensitized surface be-f-l hind the lens has been `exposed and is to lbei displaced before another exposure is made.

When a fresh section of the sensitized sur- If an instantaneous exposure is' face-is moved into proper position for exposure, las by rotating therroll 5 by .means of the hand piece 6, the movement of the film 3 rotates thewheel 33 andshaft 32 which in turn rotates the disks 41 and 42 in opposite directions and the pin 43 on wheel 41 strikes the arm 55 of the semaphore and i rocks the semaphore to vertical 1position, thereby withdrawing the arm 52 of t e sema-v phore from `registry with the sight openwill swing the semaphore 50, as before, during its firstmovement, by engaging and depressing the arm 54, and said semaphore can only be restored 'by feeding sig/fresh section of film to position for exposure.- 'In the reverse movement of the shutter, the end of arm 54 lies outside of the path of, the pin 10H In cameras of this type, the time exposure lever 23 may be adjusted for'operation when the shutter is inV either of its extreme positions. For example, if the shutter occu ies the position indicated in dotted lines with the sight opening 12 lying below the lens and the stop lever 23 be adjusted for a time exposure, the pin 10a coperates with the opposite'face of the lever 23, and the cam end 22 of trigger 20 coperates'` with pins* 10" and 10c respectively, that is to say, when the lever 23 is lifted and the trigger 2O is moved to the left, the pin 10b which engages the under face of thecam 22 slides from under. said cam andperinits the shutter to rotate 1n an antifclock'wise direction until the pin 10* engages the right hand side of lever 23 and the si ht opening 12 is in registry with the lens.

e trigger 20 ,is then released and the cam 22 passes to the right of pin 10. Then by swinging the trigger to the right, said pin .10 is permitted to pass out of engagement with the cam 22 and permits the s hutterto swing. to its closed position, as indicated 1n dotted lines in Fig. 1.' During the openingmove-- ment of the shutter, the pin 10 t strikes the end'of arm 54 and rocks the semaphore to the right,` thereby bringing the left-hand arm 51 of the semaphore in registry with the sight opening 9, the semaphore and its appurtenant parts occupying the positionindicated Aby the long dotted lines in Fig. 1, with Athe arm 54 engaging stop 56. When a new section of film `is moved behind thelens the pin 44 Qn disk 42 strikesl he depressed arm 55- of a semaphore and rocks the sema- `:phore back to vvertical position.

' It will therefore be seen that the Semaphore is positively actuated to display an exposure indication each and every time the shutter is moved to eiect an, exposure Whether the latter be an instantaneous or a time exposure, and said semaphore is likewise restored to its normal or non-indicating position Whenever a new sensitized surface is presented in proper position for exposure.

While the inventionl is illustrated as applied to a lm-roll oscillating-shutter type of camera, it will be obvious that it is not limited to such type of apparatus, but is applicable to magazine cameras generally in which successive movements of the sensitized medium would serve to actuate the semaphore to restorethe same to non-indicating position, and in which the movement of thearm to restorethe semap ore, and means operated b the movement of the film to actuate sai rotary members.

2. In a roll-film camera having a movable shutter and a sight opening, the combination of a pivoted semaphore adapted to be movedV into and out of re 'stry kwith said sight opening, armscarriegl by s'aid semaphore, an abutment on the vshutter to engage one of said arms to move the semaphore into registry with said opening, rotary members having abutments coperatingwith the other arm to restore the semaphore, a wheel o r" ated by thev movement -of the film, a s aft driven by said wheel, and shafts connected to said rotary members and geared to said ment of the film will restore said semaphore.

first mentioned shaft whereby feeding move- 3. In a roll film camera having a movable shutter and a sight opening, the combination with a semaphore having arms radiat' from its pivot point, of an abutment on the shutter adapted to engage one of said arms to move the semaphore into registration with the sight opening upon the movement of the shutter, and means for engaging the other arm to move the semaphore out of registration with the sight opening when the film is V advanced. 4. In a roll film camera, having a movable shutter and a sight opening, the combination with a semaphore having rigid arms extending therefrom', of means on `the shutter tor` engaging one of said arms to move the semaphore into registration with the sight opening, and means associated with the film advancing mechanism for engaging the other arm to move the semaphore vout of y registra- .tion upon the advance of the iilm.

5. In a camera having a shutter adjustable for time exposures, the combination with a semaphore, of an abutment on the shutter adapted to engage the semaphore to ,move the same upon the movement of the shutter in one direction, but inoperative to move the semaphore upon the movement of the shutter in the opposite direction.

v6.- In a camera having a shutter adjustable for time exposures, the combination with a semaphore, of means on the shutter for actuating the semaphore upon the movement of the shutter in one direction, said means 'being inoperative to move the semaphore. upon the movement of the shutter in the opposite direction. V

7. In a camera having an oscillatory shutter, adjustable for time exposures, the combination with a semaphore having an arm projecting therefrom, an abutment on the shutter arranged to engage said arm to move the semaphore upon the movement of the shutter in one direction, the extent of movement of the arm being such that it will lie out of. the path of movement of the abutment upon the movementofthe shutter in the opposite direction.

Signed at New York, in the county of New York, and State of New York, this 28th day of October, A. D. 1916.

GEORGE w. weiss.

Witnesses:

' Moms NEWMAN,

R. D. Wnmorr. 

